<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <el-breadcrumb-item>
      <span>{{ env.name }}</span>
    </el-breadcrumb-item>
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
        <span v-if="item.redirect==='noRedirect' || index === levelList.length - 1" class="no-redirect">
          {{ item.meta.title }}
        </span>
        <a v-else @click.prevent="handleLink(item)">
          {{ item.meta.title }}
        </a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp'
import { mapGetters } from 'vuex'
export default {
  data() {
    return {
      levelList: null
    }
  },
  computed: {
    ...mapGetters([
      'env'
    ])
  },
  watch: {
    $route() {
      this.getBreadcrumb()
    }
  },
  created() {
    this.getBreadcrumb()
  },
  methods: {
    getEnv(name) {
      return (name || '系统首页')
      // return '(' + this.env.name + ')' + (name || '系统首页')
    },
    getBreadcrumb() {
      console.group('getBreadcrumb')
      console.log('this.env', this.env)
      console.log('matched', matched)
      console.groupEnd()
      // only show routes with meta.title
      let matched = this.$route.matched.filter(item => item.meta && item.meta.title)
      const first = matched[0]

      if (!this.isDashboard(first)) {
        matched = [{ path: '/dashboard', meta: { title: this.getEnv('系统首页') }, redirect: 'noRedirect' }].concat(matched)
      } else {
        matched[0]['meta']['title'] = this.getEnv(matched[0]['meta']['title'])
      }
      console.log(matched)
      this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
      console.log(this.levelList)
    },
    isDashboard(route) {
      const name = route && route.name
      if (!name) {
        return false
      }
      return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
    },
    pathCompile(path) {
      // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
      const { params } = this.$route
      var toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handleLink(item) {
      const { redirect, path } = item
      if (redirect) {
        this.$router.push(redirect)
        return
      }
      this.$router.push(this.pathCompile(path))
    }
  }
}
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
